'Soiled' in the Bible

Come close to God [with a contrite heart] and He will come close to you. Wash your hands, you sinners; and purify your [unfaithful] hearts, you double-minded [people].

But you [still] have a few people in Sardis who have not soiled their clothes [that is, contaminated their character and personal integrity with sin]; and they will walk with Me [dressed] in white, because they are worthy (righteous).